1. World Health Organization. WHO Coronavirus Disease (COVID-19) Dashboard. 2020 [cited 2021 Oct. 6]; Available from: https://covid19.who.int.
2. Ritchie, H., et al. Coronavirus pandemic (COVID-19). Our World In Data 2020 Oct. 6, 2021 [cited 2021 Oct. 6]; Available from: https://ourworldindata.org/coronavirus.
3. Access to and equitable distribution of COVID-19 vaccine in low-income countries;Acharya;npj Vaccines,2021
4. Progress of the COVID-19 vaccine effort: viruses, vaccines and variants versus efficacy, effectiveness and escape;Tregoning;Nat Rev Immunol,2021
5. COVID-19 vaccines for low- and middle-income countries;Choi;Trans R Soc Trop Med Hyg,2021